diff --git a/frontend/src/app/messages/[chatId]/page.tsx b/frontend/src/app/messages/[chatId]/page.tsx
index 4149e686..5d3bf140 100644
--- a/frontend/src/app/messages/[chatId]/page.tsx
+++ b/frontend/src/app/messages/[chatId]/page.tsx
@@ -1328,29 +1328,6 @@ function MessageDialogPageContent() {
     return () => vv.removeEventListener("resize", onResize);
   }, []);
 
-  // Redirect wheel events outside chat container into it
-  useEffect(() => {
-    const onWheel = (e: WheelEvent) => {
-      if (e.defaultPrevented || mediaPreview) return;
-      const c = messagesViewportRef.current;
-      if (!c?.containerRef?.current) return;
-      const v = c.containerRef.current;
-      const t = e.target as HTMLElement | null;
-      if (
-        !t ||
-        v.contains(t) ||
-        t.closest("[data-overlay-root='true'], [role='dialog'], [aria-modal='true']") ||
-        t.closest("textarea,input,button,a,video,audio,[contenteditable='true']")
-      ) {
-        return;
-      }
-      e.preventDefault();
-      v.scrollTop += e.deltaY;
-    };
-    window.addEventListener("wheel", onWheel, { passive: false });
-    return () => window.removeEventListener("wheel", onWheel);
-  }, [mediaPreview]);
-
   /* ──────────────────────────────────────────────────────
    * RENDER
    * ────────────────────────────────────────────────────── */
@@ -1445,7 +1422,7 @@ function MessageDialogPageContent() {
                   ) : displayMessages.length === 0 ? (
                     <p className="app-text-muted text-center text-sm">Пока нет сообщений. Напишите первым.</p>
                   ) : (
-                    <div className="flex min-h-full flex-col justify-end">
+                    <div className="mx-auto flex min-h-full w-full max-w-[64rem] flex-col justify-end">
                       {cm.loadingOlder ? <p className="app-text-muted mb-3 text-center text-xs">Подгружаем старые сообщения...</p> : null}
                       {displayMessages.map((message, index) => {
                         const replyToId = getReplyToId(message);
@@ -1515,11 +1492,11 @@ function MessageDialogPageContent() {
 
                 {/* Scroll-to-bottom button */}
                 {scroll.showScrollToBottom && (
-                  <div className="pointer-events-auto absolute bottom-25 right-3 z-20 transition-opacity duration-300">
+                  <div className="pointer-events-none absolute bottom-25 left-1/2 z-20 flex w-full max-w-[64rem] -translate-x-1/2 justify-end px-3 transition-opacity duration-300">
                     <button
                       type="button"
                       onClick={() => void handleReturnToNewMessages()}
-                      className="relative inline-flex h-10 w-10 items-center justify-center rounded-full border border-[var(--border-subtle)] bg-[var(--surface-primary)] p-0 leading-none text-[var(--muted-foreground)] shadow-[0_10px_30px_rgba(15,23,42,0.22)] transition hover:bg-[var(--surface-secondary)] hover:text-[var(--foreground)] active:scale-[0.98]"
+                      className="pointer-events-auto relative inline-flex h-10 w-10 items-center justify-center rounded-full border border-[var(--border-subtle)] bg-[var(--surface-primary)] p-0 leading-none text-[var(--muted-foreground)] shadow-[0_10px_30px_rgba(15,23,42,0.22)] transition hover:bg-[var(--surface-secondary)] hover:text-[var(--foreground)] active:scale-[0.98]"
                       title="Вернуться к новым сообщениям"
                       aria-label={displayedUnreadCount > 0 ? `Вернуться к новым сообщениям (${displayedUnreadCount > 99 ? "99+" : displayedUnreadCount})` : "Вернуться к новым сообщениям"}
                     >
@@ -1535,46 +1512,48 @@ function MessageDialogPageContent() {
 
                 {/* Composer area */}
                 <div className="app-divider shrink-0 border-t bg-transparent px-4 pt-3 pb-[calc(env(safe-area-inset-bottom)+0.25rem)] lg:app-header lg:px-0 lg:pb-0">
-                  {typingIndicatorText && (
-                    <div className="app-text-muted mb-2 flex items-center gap-2 text-xs italic">
-                      <div className="flex gap-1">
-                        <span className="app-text-muted inline-block h-1.5 w-1.5 animate-bounce rounded-full bg-current" style={{ animationDelay: "0ms" }} />
-                        <span className="app-text-muted inline-block h-1.5 w-1.5 animate-bounce rounded-full bg-current" style={{ animationDelay: "150ms" }} />
-                        <span className="app-text-muted inline-block h-1.5 w-1.5 animate-bounce rounded-full bg-current" style={{ animationDelay: "300ms" }} />
+                  <div className="mx-auto w-full max-w-[64rem]">
+                    {typingIndicatorText && (
+                      <div className="app-text-muted mb-2 flex items-center gap-2 text-xs italic">
+                        <div className="flex gap-1">
+                          <span className="app-text-muted inline-block h-1.5 w-1.5 animate-bounce rounded-full bg-current" style={{ animationDelay: "0ms" }} />
+                          <span className="app-text-muted inline-block h-1.5 w-1.5 animate-bounce rounded-full bg-current" style={{ animationDelay: "150ms" }} />
+                          <span className="app-text-muted inline-block h-1.5 w-1.5 animate-bounce rounded-full bg-current" style={{ animationDelay: "300ms" }} />
+                        </div>
+                        <span>{typingIndicatorText}</span>
                       </div>
-                      <span>{typingIndicatorText}</span>
-                    </div>
-                  )}
+                    )}
 
-                  <MessageComposer
-                    canSendMessages={canSendMessages}
-                    membershipRole={myMembership?.role}
-                    editingMessageId={editingMessageId}
-                    replyTo={replyTo}
-                    attachedFiles={attachedFiles}
-                    messageText={messageText}
-                    sending={sendingComposer}
-                    showEmojiPicker={showComposerEmojiPicker}
-                    allReactions={ALL_REACTIONS}
-                    fileInputRef={fileInputRef}
-                    messageInputRef={messageInputRef}
-                    onPickFiles={handlePickFiles}
-                    onAddFiles={addAttachedFiles}
-                    onFilesChange={handleFilesChange}
-                    onRemoveFile={removeAttachedFile}
-                    onToggleEmojiPicker={() => {
-                      setShowComposerEmojiPicker(prev => !prev);
-                      setExpandedReplyActionForId(null);
-                      setReactionPickerForMessageId(null);
-                    }}
-                    onSelectEmoji={(emoji) => { appendEmojiToComposer(emoji); setShowComposerEmojiPicker(false); }}
-                    onInputClick={() => setShowComposerEmojiPicker(false)}
-                    onChangeMessage={setMessageText}
-                    onTyping={sendTyping}
-                    onSend={handleSend}
-                    onCancelEdit={handleCancelEdit}
-                    onCancelReply={() => setReplyTo(null)}
-                  />
+                    <MessageComposer
+                      canSendMessages={canSendMessages}
+                      membershipRole={myMembership?.role}
+                      editingMessageId={editingMessageId}
+                      replyTo={replyTo}
+                      attachedFiles={attachedFiles}
+                      messageText={messageText}
+                      sending={sendingComposer}
+                      showEmojiPicker={showComposerEmojiPicker}
+                      allReactions={ALL_REACTIONS}
+                      fileInputRef={fileInputRef}
+                      messageInputRef={messageInputRef}
+                      onPickFiles={handlePickFiles}
+                      onAddFiles={addAttachedFiles}
+                      onFilesChange={handleFilesChange}
+                      onRemoveFile={removeAttachedFile}
+                      onToggleEmojiPicker={() => {
+                        setShowComposerEmojiPicker(prev => !prev);
+                        setExpandedReplyActionForId(null);
+                        setReactionPickerForMessageId(null);
+                      }}
+                      onSelectEmoji={(emoji) => { appendEmojiToComposer(emoji); setShowComposerEmojiPicker(false); }}
+                      onInputClick={() => setShowComposerEmojiPicker(false)}
+                      onChangeMessage={setMessageText}
+                      onTyping={sendTyping}
+                      onSend={handleSend}
+                      onCancelEdit={handleCancelEdit}
+                      onCancelReply={() => setReplyTo(null)}
+                    />
+                  </div>
                 </div>
               </div>
             </>
diff --git a/frontend/src/app/tasks/page.tsx b/frontend/src/app/tasks/page.tsx
index 96e6bac8..b8ea9c0b 100644
--- a/frontend/src/app/tasks/page.tsx
+++ b/frontend/src/app/tasks/page.tsx
@@ -5598,7 +5598,7 @@ function TasksPageContent() {
             className={`${mobileBoardOpen ? "hidden" : "flex"} h-[calc(100dvh-7rem)] w-full ${desktopWideMode ? "lg:flex lg:h-full lg:shrink-0" : ""}`}
           />
 
-          <div className={`${mobileBoardOpen ? "flex" : "hidden"} relative min-h-0 min-w-0 flex-1 flex-col gap-4 ${desktopWideMode ? "lg:flex lg:h-full" : "xl:flex xl:h-full"}`}>
+          <div className={`${mobileBoardOpen ? "flex" : "hidden"} relative min-h-0 min-w-0 flex-1 flex-col gap-4 ${desktopWideMode ? "lg:flex lg:h-full" : ""}`}>
         <section className="app-surface relative z-30 shrink-0 overflow-visible rounded-2xl p-4">
           <div className="flex items-center justify-between gap-3">
             <div className="flex min-w-0 items-center gap-2">
diff --git a/frontend/src/components/ScrollableMessageList.tsx b/frontend/src/components/ScrollableMessageList.tsx
index fde3c025..6574bedd 100644
--- a/frontend/src/components/ScrollableMessageList.tsx
+++ b/frontend/src/components/ScrollableMessageList.tsx
@@ -155,7 +155,11 @@ export class ScrollableMessageListInner extends Component<ScrollableMessageListP
   /**
    * Восстанавливает позицию скролла ПОСЛЕ обновления React
    */
-  componentDidUpdate(_prevProps: ScrollableMessageListProps, _prevState: any, snapshot: Snapshot | null) {
+  componentDidUpdate(
+    _prevProps: ScrollableMessageListProps,
+    _prevState: Readonly<Record<string, never>>,
+    snapshot: Snapshot | null,
+  ) {
     if (!snapshot) return;
 
     const container = this.containerRef.current;
@@ -337,8 +341,10 @@ export class ScrollableMessageListInner extends Component<ScrollableMessageListP
     const container = this.containerRef.current;
     if (!container) return;
 
-    // Принудительно ставим scrollTop на максимум — самый надёжный способ
-    container.scrollTop = container.scrollHeight;
+    container.scrollTo({
+      top: container.scrollHeight,
+      behavior: scrollBehavior === 'smooth' ? 'auto' : scrollBehavior,
+    });
 
     this.lastClientHeight = container.clientHeight;
     this.noScroll = true;
@@ -369,6 +375,7 @@ export class ScrollableMessageListInner extends Component<ScrollableMessageListP
         style={{
           overflowY: 'auto',
           overflowX: 'hidden',
+          overscrollBehaviorY: 'contain',
           height: '100%',
           position: 'relative',
         }}
@@ -384,7 +391,7 @@ export class ScrollableMessageListInner extends Component<ScrollableMessageListP
 // ForwardRef обертка для использования с useRef в функциональных компонентах
 export const ScrollableMessageList = forwardRef<ScrollableMessageListInner, ScrollableMessageListProps>(
   (props, ref) => {
-    return <ScrollableMessageListInner ref={ref as any} {...props} />;
+    return <ScrollableMessageListInner ref={ref} {...props} />;
   }
 );
 
diff --git a/frontend/src/components/messages/ChatMessageItem.tsx b/frontend/src/components/messages/ChatMessageItem.tsx
index bde93657..896fd75e 100644
--- a/frontend/src/components/messages/ChatMessageItem.tsx
+++ b/frontend/src/components/messages/ChatMessageItem.tsx
@@ -223,7 +223,13 @@ export default function ChatMessageItem({
           </div>
         ) : null}
 
-        <div className={`flex min-w-0 items-start gap-1 ${isMine ? "max-w-[88%] flex-row-reverse" : "max-w-[calc(100%-2.5rem)]"}`}>
+        <div
+          className={`flex w-fit min-w-0 items-start gap-1 sm:max-w-[min(78%,46rem)] ${
+            isMine
+              ? "max-w-[88%] flex-row-reverse"
+              : "max-w-[calc(100%-2.5rem)]"
+          }`}
+        >
           <div className={`relative min-w-0 rounded-2xl px-3 py-2 pr-9 transition-shadow duration-300 ${isMine ? "bg-sky-500 text-white" : "app-surface-elevated text-[var(--foreground)]"} ${isHighlighted ? (isMine ? "shadow-[0_0_0_3px_rgba(125,211,252,0.45)]" : "ring-2 ring-sky-300 shadow-[0_0_0_4px_rgba(186,230,253,0.28)]") : ""}`}>
             {hasActions ? (
               <div className="absolute right-1 top-1 z-20">
@@ -296,7 +302,9 @@ export default function ChatMessageItem({
             {message.is_deleted ? (
               <p className={`italic text-sm ${isMine ? "text-sky-100" : "app-text-muted"}`}>Сообщение удалено</p>
             ) : message.content ? (
-              <p className="whitespace-pre-wrap break-words text-sm leading-5">{message.content}</p>
+              <p className="whitespace-pre-wrap break-words text-sm leading-5 [overflow-wrap:anywhere]">
+                {message.content}
+              </p>
             ) : null}
 
             {message.attachments && message.attachments.length > 0 ? (
diff --git a/frontend/src/components/messages/MessagesFocusSidebar.tsx b/frontend/src/components/messages/MessagesFocusSidebar.tsx
index 41850a5a..7ceb2dfd 100644
--- a/frontend/src/components/messages/MessagesFocusSidebar.tsx
+++ b/frontend/src/components/messages/MessagesFocusSidebar.tsx
@@ -114,7 +114,7 @@ export default function MessagesFocusSidebar({
         <MessagesChatListControls userId={user?.id} chatTypeCounts={chatTypeCounts} />
       </div> : null}
 
-      <div className={`min-h-0 flex-1 space-y-2 overflow-y-auto pb-4 ${sidebarCollapsed ? "px-2 pt-2" : "px-4"}`}>
+      <div className={`min-h-0 flex-1 space-y-2 overflow-y-auto overscroll-y-contain pb-4 ${sidebarCollapsed ? "px-2 pt-2" : "px-4"}`}>
         {loading ? (
           <p className="app-text-muted px-3 py-6 text-center text-xs">Загрузка чатов...</p>
         ) : visibleChats.length === 0 ? (